<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert
                title="添加商品信息"
                type="info"
                center
                show-icon :closable="false">
            </el-alert>
            <!-- 步骤条区域 -->
            <!-- activeIndex-0作用将字符串变成数字 -->
            <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <!-- Tab栏区域 -->
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <!-- 商品分类：级联选择器 -->
                            <el-cascader
                            v-model="addForm.goods_cat" :options="catelist"
                            :props="cateProps"
                            @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTabData" :key="item.attr_id">
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action 表示要上传到的后台API地址
                            为上传添加token请求头 -->
                        <el-upload
                        :action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button></el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品的按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览对话框 -->
        <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
        <img :src="previewPath" alt="" class="previwImg">
        </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'
export default{
    data(){
        return {
            activeIndex:'0',
            //添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                //商品所属的分类数组
                goods_cat:[],
                //图片数组
                pics:[],
                //商品的详情描述
                goods_introduce:'',
                attrs:[]
            },
            //表单验证规则对象
            addFormRules:{
                goods_name:[
                    { required:true,message:'请输入商品名称',trigger:'blur'}
                ],
                goods_price:[
                    { required:true,message:'请输入商品价格',trigger:'blur'}
                ],
                goods_weight:[
                    { required:true,message:'请输入商品重量',trigger:'blur'}
                ],
                goods_number:[
                    { required:true,message:'请输入商品数量',trigger:'blur'}
                ],
                goods_cat:[
                    { required:true,message:'请选择商品分类',trigger:'blur'}
                ]
            },
            //商品分类数据列表
            catelist:[],
            // 级联选择器配置对象
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children',
                expandTrigger:'hover'
            },
            //动态参数列表数据
            manyTabData:[],
            //静态属性列表数据
            onlyTabData:[],
            //图片上传的URL
            uploadURL:"http://127.0.0.1:8888/api/private/v1/upload",
            //图片文件上传组件的header请求头对象
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类数据失败')
            }
            this.catelist=res.data
        },
        //级联选择器选中项变化会触发的函数
        handleChange(){
            // console.log(this.addForm.goods_cat);
            if(this.addForm.goods_cat.length!==3){
                this.addForm.goods_cat=[]
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            if(oldActiveName==='0'&&this.addForm.goods_cat.length!==3){
                this.$message.error('请输入商品分类')
                return false
            }
        },
        async tabClicked(){
            // 证明访问的是商品参数面板
            if(this.activeIndex==='1'){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
                if(res.meta.status!==200){
                    return this.$messsage.error('请求动态参数列表失败')
                }
                res.data.forEach(item=>{item.attr_vals=item.attr_vals.length===0?[]:item.attr_vals.split(' ')})
                this.manyTabData=res.data
            }else if(this.activeIndex==='2'){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
                if(res.meta.status!==200){
                    return this.$messsage.error('获取静态属性失败')
                }
                this.onlyTabData=res.data

            }
        },
        //处理图片预览效果
        handlePreview(file){
            // console.log(file);
            this.previewPath=file.response.data.url
            this.previewVisible=true
        },
        //处理移除图片的操作
        handleRemove(file){
            // console.log(file);
            //1. 获取将要删除的图片的临时路径
            const filePath=file.response.data.tmp_path
            //2. 从pics数组中找到该图片对应的索引
            const i= this.addForm.pics.findIndex(x=> x.pic===filePath)
            //3. 调用图片的splice方法，把图片信息对象从pics数组中移除掉
            this.addForm.pics.splice(i,1)
            // console.log(this.addForm);
        } ,
        //监听图片上传的事件
        handleSuccess(response){
            // console.log(response);
            //1. 拼接得到一个图片信息对象
            const picInfo={
                pic:response.data.tmp_path
            }
            //2. 将图片信息对象push到pics数组中
            this.addForm.pics.push(picInfo)
            // console.log(this.addForm);
        },
        //添加商品
        add(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项！')
                }
                //执行添加商品的业务逻辑
                const form =_.cloneDeep(this.addForm)
                form.goods_cat=form.goods_cat.join(',')
                //处理动态参数
                this.manyTabData.forEach(item=>{
                    const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                //处理静态属性
                this.onlyTabData.forEach(item=>{
                    const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs=this.addForm.attrs
                // console.log(form);
                //发起请求添加商品
                //商品的名称必须是唯一的
                const {data:res}=await this.$http.post('goods',form)
                if(res.meta.status!==201){
                    return this.$message.error('添加商品失败')
                }
                this.$message.success('添加商品成功')
                this.$router.push('/goods')
            })
        }      
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length===3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>
<style lang="less" scoped>
.el-steps{
    margin:15px 0;
}
.el-step__title{
    font-size:13px!important;
}
.el-checkbox{
    margin:0 10px 0 0!important;
}
.previwImg{
    width: 100%;
}
.btnAdd{
    margin-top:10px;
}
</style>
